Shear



April 15, 1941. *l l H, H ALBo-r v 2,238,542

' sumti I Fired Aug. 3, 1940 WITNEJJE mesas Apr. is, mi

nom n. what, mutuels ra., mimmso' United Engineering and FoundryCompany.

Pittsburgh, Pa., a corporation of Pennsylvania application August a,1940, serial No.Y 350,321

`'iz claims.

This invention relates to flying shears for severing, strip materialinto predetermined lengths,

and more particularly to shears of this character of the rotary type. l,

The desideratum. in the operation ,of flying( shears of this type is toproduce the cuts with the blade carriers or drums rotating at a uniformspeed and thus avoid constant acceleration and deceleration. To obtainthis, if the strip is to be cut into relatively short lengths 'thedrunsmustbe of Asmall diameter. On. the other hand, it is .usuallynecessary to shear the strip into pieces of different lengths, and todoso by varying the rotational velocity of the drums during everyrevolution. This increases the strain on the entire apparatus. To h'oldthis strain as low as possible it is again ldesirable to use drums ofrelatively small diameter so that there' isnot so much inertia toovercome. In either case, if the strip is wide the long drums of "smalldiameter are likely toA be bowed or 'deiiected out of line when theblades carried thereby strike the strip. This, of course, preventsproper shearing.

It is among the objects of this invention to pro vide a rotary type,flying shear in which the blade carrying drums are of small diametercompared with their length but are prevented from bending f my flyingshear, partly broken away to show the f backing roll mounting; Fig. 2 isa 'vertical s'ec- .during shearing, in which the impact of shearing istransmitted to the'v shear frame principally through means other thanthe bearings of the'. drums, andnin which the rotational velocity ofthe.

`drums can be accelerated andvdeceleratedl between cuts without placingundue strain on the` apparatus. l

In accordance with this -invention a ipair/of blade carriers, such assuperimposed drums, are

'thef drums make one revolution.v lengthsare caught by a beltvconveyor 9and carf` tion taken on the line II--II of Fig. l; and Fig.

3 is a view similar to.` Fig. vl showing in full the 'shear drive and amodified drive yfor the backing rolls.

Referring to Figs. l and 2 of ,the drawing, a pair of drums I'arejournaled at their endsin superimposed relation in the sides of ahousing 2. The drums are spaced far enough apart to 'permit metal stripto be continuously fed between them from a guide I leading trompa rollerleveler or other apparatus. The lower drum is driven in the same manneras the embodiment in- Fig. -3 through an adjustable acceleratingmechanism {(Fig. 3), such as shown in my Patent No.

y2,i.l6'1.,5l3, from the shaft 5 of a motor 6.

Mounted on the outer ends of the drum necks at the opposite vside of thehousing are gears 1 which mesh' with each other so that the two drumsrotate in unison. Extending lengthwise of each drum and suitablyattached thereto is a shear blade 8. The two blades in this embodimentare mounted on the drums in such positions that they cooperate inshearing the strip every time The sheared ried away to be piled.

It is a feature of this invention that although the drums Ahavediameters which are small enough in yconriparison.with their lengths topermit the drums and bladesv to bow away from the strip yrotatablymounted in aframe in such manner that strip material can pass betweenthem, and

they carryshear'blades whichfcooperate in periodically severing thelmoving strip. Although the drums are long andl narrow, they areprevented during the shear cuts, they are prevented from l doingthis.Accordingly,l the drums are supported vbybacllring means which preventthem from being deflected in this manner. Preferably, the backing meanscomprise a pair of short rolls il adapted `to engage ythe centralportion of each drum ron both sides oi` the vertical center line ofthepass from bending at the time of cutting by backing rolls. These backingrolls are provided with re, n

cesses `extending across their faces for receiving the blades while theyare passing the rolls. The rolls may engage the drums at all timeabut itis preferred that the faces of the rolls be spaced from the 'drums andbe provided with projecting wear-resisting inserts which engage thevdrumsonly during the cut. The backing rolls may be Y so as to preventthe drum from'beingvdeflected vertically or horizontally. Each roll isrotatably mounted in a frame .I2 which is mounted in the housing for.sliding ladjustment transversely -oi the drums on the side opposite tothe/pass, and can be moved inwardly by an adjusting screw I3 in orderto` compensate forwear and to vary the pressure on the adjoining drum.Although the ,'rollsv lmay be. made to engagethe drums at'all .I times,friction` and wear can be reduced if they driven either at a uniformspeed, or at a varying` velocity in accordance with the variable Vdriveof the drums.

The invention is illustrated in the accompanyare spaced from the drumsand only engage them during the shear cuts. Forl this purpose the rollsare provided `with projections which are preferably in the form ofhardened contact members vil inserted in the roll faces across whichthey y extend. Likewise, f the central portions of the drums may beprovided with similar hardened 'inserts I5 for engaging contact membersI4. 'Ihe various inserts are so positioned circumferentially of the,rolls and drums relative to the shear blades that inserts I4 engageinserts I5 only at the time of a cut, at which time they take the shockof the shearing impact and thus protect the rolls and drums. This impactis transmitted to the shear housing principally through the backingrolls, rather than through the drum necks. The rest of the time thedrums and rolls are free of each other. The hardened inserts also takethe wear and can be replaced when worn without having to replace thedrums and rolls.

To prevent the shear blades from interfering with the rotation of thedrums, in case the backing rolls are not spaced far enough from thedrums to clear the blades, the rolls are provided with recesses I6extending across their faces for receiving the blades as they pass therolls. Registering of the blades and recesses, as well as engagement ofinserts I4 and I5, is assured by connecting a shaft I1 to each backingroll and driving it from its outer end by a gear I8 meshing with one ofthe gears] on the drums. If the velocity kof the drums is varied duringeach revolution by mechanism 4 (Fig. 3) the velocity of the rolls isvaried in synchronism therewith. f

the hardened inserts to project from the rolls and drums.

On the other hand, acceleration and deceleration of the rolls can beavoided, as shown in Fig. 3, by driving them at a uniform speed throughshafts 2| carrying gears 22 on-their outer ends. These gears areJournaled in a gear case 23 through which drive shaft 5 extends. Rigldlymounted on the drive shaft is a gear 24 that drives the lower pair ofgears 22 at a uniform speed, and that also drives an idler gear 25journaled in the gear case where it meshes with the upper pair of gears22. As the drums may be rotating at a higher xspeed than the backingrolls at the time that the shear blades pass the rolls, it may be founddesirable to provide the rolls with wider7blade-receiving recesses thanin the ilrst embodiment. Hardened inserts I4 and I5 (Fig. 2) are ofespecial importance in the embodiment of Fig. 3 in which the drums andbacking rolls rotate at different speeds during at least part of everyrevolution. 'Ihisl would cause slippage and wear between them, but,theprojecting rhardened inserts reduce this to a minimum, or

eliminate it entirely if the rolls and drums are rotating at the `samespeeds during the cut.

According to the provisions of the patent statutes, I have explained theprinciple and construction of my invention and have illustrated anddescribed what I now consider to represent its best embodiment. However,I desire to have it understood that, within the scope of the appendedclaims, the invention may be practiced otherwise than as specificallyillustrated and described.

I claim:

1. A ying shear comprising a pair of rotatably mounted blade carriersbetween which strip material is adapted to pass, a pair of shear bladesmounted on the rotating carriers for periodically severing said strip,and means for backing up said carriers against deflection at the time ofshearing.

2. A flying shear comprising a pair of rotatably mounted superimposedblade carriers between which strip material is adapted to pass, a pairof course, it is not necessary in this embodiment for shear bladesmounted on the rotating carriers for periodically severing said strip,and backing rolls for supporting said carriers against bending at thetime of shearing.

3. A flying shear comprising a pair of rotatably mounted superimposeddrums between which strip material is adapted to pass, a pair of shearblades carried by the rotating drums for periodically severing saidstrip, and a pair of backing rolls engaging each drum atcircumferentially spaced points on the drum at the time of shearing.

4. A flying shear comprising a pair of rotatably mounted superimposedblade carriers between which strip material is adapted to pass, a pairof shear bladesl carried by the rotating carriers for periodicallysevering said strip, backing rolls engaging said carriers at the time ofshearing, each of said rolls being provided with a recess extendinglongitudinally across its face for receiving the shear blade attached tothe adjoining carrier as the blade is carried past the roll, and meanssynchronizing the rotation of the carriers and rolls so that saidrecesses always receive said blades while the blades are passing therolls. v

5. A flying shear comprising a pair of rotatably mounted superimposeddrums between which strip material is adapted to pass, a pair of shearblades carried by the rotating drums for periodically severing saidstrip, backing rolls for said drums for supporting them against bendingat the time of shearing, and hardened contact members connected to saidrolls and drums in such positions that they engage each other at thetime of shearing and transmit the shearing impact from the drums to therolls.

6. A flying shear comprising a pair of rotatably mounted superimposeddrums between which strip material is adapted to pass, a pair of shearblades carried by the rotating drums for periodically severing saidstrip, backing rolls for said drums for supporting them against bendingat the time of shearing, and hardened contact members connected to saidrolls and drums in such positions that they engage each other at thetime of shearing and transmit the shearing impact from the drums to therolls, the faces of said rolls and drums being out of contact with oneanother.

7. A flying shear comprising a pair of rotatably mounted superimposeddrums between which strip material is adapted to pass,a pair of shearblades carried by the rotating drums for periodically severing saidstrip, backing rolls for said drums for supporting them against bendingat the time of shearing, and hardened contact members connected to saidrolls and drums in such positions that they engage each other at thetime of shearing and transmit the shearing impact from the drums to therolls, the hardened members of said rolls projecting from the facesthereof whereby those faces are spaced from the drum faces.

8. A flying shear comprising a pair of rotatably mounted superimposedblade carriers between which strip material is adapted to passcontinuously, a pair of shear blades mounted on the rotating carriersfor periodically severing said strip, means for driving said carriers atvelocities varying during each revolution, backing rolls for saidcarriers on the sides opposite to the strip, and means for driving saidrolls at a uniform speed.

9. A flying shear comprising a pair of rotatably mounted superimposedblade carriers between which strip material is adapted to passcontinuously, a pair of shear blades carried by the rotating carriersfor periodically severing said strip, means for driving said carriers'atvvelocities varying during each revolution, backing rolls for saidcarriers on the sides opposite to the strip, 'and means for driving saidro1ls` at the same varying velocities as the blade carriers.

10. A flying shear comprising a pair of rotatably mounted superimposedblade carriers between which strip material is adapted to passcontinuously, a pair of shear blades carriedby the rotating carriers forperiodically severing said strip. means for driving said carriers at.veloci ties varying during each revolution, backing rolls for saidcarriers on the sides opposite to the strip,

and means gearing the rolls directly to the carlriers -sol that therolls are driven by the blade carriers. y

11. A iiying shear comprising a pair of rotatably-mounted superimposedblade carriers be tween which strip material is adapted to pass, a

plurality of cooperating shear blades carried by the rotating carriersfor periodically severing said strip. `ba'clringrolls engaging saidcarriers. each of said rolls being provided with a plurality of recessesextendinglongitudinally across its face for receiving the shear bladesattached to the adjoining carrier as the blades are carried past theroll, and means synchronizing the rotation of the carriers and rolls sothat said recesses always receive said blades while the blades arepassing the rolls.

12. A ying shear comprising a pair of rotatably-mounted superimposeddrums between which strip material is adapted to pass, a pair of shearblades carried bythe rotatingv drums for periodically severing saidstrip, a pair of backing rolls engaging each drum atcircumferentiallyspaced points and each of said-rolls being providedwith a recess extending longitudinally across its face for receiving`the shear blade attached to the adjoining carrier as the blade iscarried past the roll.

, HOWARD H. TALBOT.

